SN74CBT3245C系列介绍资料

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SN74CBT3245C

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具有 –2V 下冲保护和 1 个控制输入的 5V、1:1 (SPST)、8 通道 FET 总线开关

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The SN74CBT3245C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r_on), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT3245C provides protection for undershoot up to –2 V by sensing an undershoot event and ensuring that the switch remains in the proper OFF state.

The SN74CBT3245C is organized as an 8-bit bus switch with a single output-enable (OE) input. When OE is low, the bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the bus switch is OFF, and the high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using I_off. The I_off feature ensures that damaging current will not backflow through the device when it is powered down.

To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Undershoot Protection for Off-Isolation on A and B Ports Up to –2 V
Bidirectional Data Flow, With Near-Zero Propagation Delay
Low ON-State Resistance (r_on) Characteristics (r_on = 3 Typical)
Low Input/Output Capacitance Minimizes Loading and Signal Distortion (C_io(OFF) = 5 pF Typical)
Data and Control Inputs Provide Undershoot Clamp Diodes
Low Power Consumption (I_CC = 3 µA Max)
V_CC Operating Range From 4 V to 5.5 V
Data I/Os Support 0 to 5-V Signaling Levels (0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V)
Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs
I_off Supports Partial-Power-Down Mode Operation
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Performance Tested Per JESD 22
- 2000-V Human-Body Model (A114-B, Class II)
- 1000-V Charged-Device Model (C101)
Supports Both Digital and Analog Applications: USB Interface, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating

Configuration	1
Number of channels	8
Power supply voltage - single (V)	5
Protocols	Analog
Ron (typ) (Ω)	3
CON (typ) (pF)	14
Bandwidth (MHz)	200
Operating temperature range (°C)	-40 to 85
Features	Powered-off protection, Undershoot protection
Input/output continuous current (max) (mA)	128
Rating	Catalog
Drain supply voltage (max) (V)	5.5
Supply voltage (max) (V)	5.5

SOIC (DW)	20	131.84 mm² 12.8 x 10.3
SSOP (DB)	20	56.16 mm² 7.2 x 7.8
SSOP (DBQ)	20	51.9 mm² 8.65 x 6
TSSOP (PW)	20	41.6 mm² 6.5 x 6.4
TVSOP (DGV)	20	32 mm² 5 x 6.4
VQFN (RGY)	20	15.75 mm² 4.5 x 3.5

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SN74CBT3245C

具有 –2V 下冲保护和 1 个控制输入的 5V、1:1 (SPST)、8 通道 FET 总线开关

4000-306-326